Door-knob.



No. 677,625. Patented luly 2, |901.-

c. F. uiua.

l D003 KNOB.

[Application filed Jan. 1B, 1901 (N0 Model.)

Iliff.

a g V UNITED STATES PATENT TTTCE,

CARL F. BIELE, NEW' YORK, N. Yr

Doorn-KNOB.

SPECIFICATION forming part of Letters Patent No. 677,625, dated July 2,190i.

Application filed January-18, 1901. Serial No. 43,748. (No model.)

To all whom, it may concern:-

' Be it known that I, CARL F. BIELE, a citizen of the United States,residing in New York, borough of Manhattan, in the State of New York,have invented certain new and useful Improvements in Door Knobs, ofwhich the following is a specication.

This invention relates to an improved knob for the doors of privateoffices, factories, tbc., where it is desired to exclude the generalpublic and permit the door to be opened only by employees and othersconversant with the construction of the knob; and the invention consistsof a door-knob which comprises an outer recessed false knob, an innermovable auxiliary knob, and a rotatable operatingspindle connected withsaid auxiliary knob; and the invention consists,further,of certaindetails of construction and combinations of parts, which will be fullydescribed hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure lis a perspective View of myimproved doorknob shown in position upon a door, and Fig. 2 is averticalv longitudinal section of the same.

Similar letters of reference indicate corresponding parts. A

Referring to the drawings, A represents the door, and B a false knob,which is preferably fixed stationary upon the door and which may be madeintegral with the roseplate C. The shank of the false knob is madetubular, and the face of the same is provided with a circular recess b,in which is placed an auxiliary door-knob D, which is provided withfouror more semicircular recesses el, that serve for placing the thumb andthree adjacent fingers of the hand in the same, so as to permit theturning of the auxiliary knob on its axis. The shank D is made in onepiece with the spindle E, which passes through the door and is providedat its inner side with' a door-knob F in the usual manner. At the centerof the auxiliary knob D is arranged a square, round, or other projectiond, which is intended to represent the termination of the spindle D.

When it desired to open the door,the thumb and three adjacent fingersare placed in the recesses of the auxiliary knob I) and the same turnedthereby so as to withdraw the reason that as the auxiliary knob D iswithin i the contour of the stationary or false knob B, the fingers andhand do not contact with said auxiliary knob, or at all events not withsufficient friction to operate the spindle and withdraw the latch. Thedooris opened from the opposite side in the usual manner by the knob F.

My improved construction of door-knob prevents the opening of au officeor other door by parties who are not desired to enter, but permits theopening and entrance by em'- ployees or other parties familiar with theknob. The recesses and center projection of the auxiliary knob D may bemade in different shapes or grouped differently, provided they are soarranged that the fingers of the hand can be readily inserted forturning the auxiliary knob and opening thereby the door withoutdifficulty. The auxiliary door-knob can be made integral with thespindle or attached to the same and the false knob may be made integralwith the rose-plate C or separated therefrom and connected with the doorin any suitable manner.

Having thus described my invention, I claim as new and desire to secureby Letters Patent l. A door-knob, consisting of an'outer recessed falseknob, an inner movable auxiliary knob, and a rotatable operating-spindleconnected with said auxiliary knob, substantially as set forth.

2. A door-knob, consisting of an outer re cessed false knob madeintegral with the roseplate and secured to the door, a rotatableauxiliary knob located in the recess of the false knob, and providedwith recesses for the fingers of the hand, and a rotatableoperating-spindle connected with said auxiliary knob, substantially asset forth.

In testimony that I claim the foregoing as my invention I have signed myname in pres; ence of two subscribing witnesses.

CARL F. BIELE. nesses: JOSEPH H. NILEs, PAUL GoErEL.

